Revert "dri_interface: add interface for EGL_EXT_image_flush_external"

This reverts commit 75204784.

This series caused unexpected flickering artifacts with Iris driver on
Chrome OS and EGL_EXT_image_flush_external spec has not been published
yet.

Acked-by: Eric Engestrom <eric@engestrom.ch>
Acked-by: Kristian H. Kristensen <hoegsberg@google.com>
50 jobs for !2705 with revert-image-flush-external in 15 minutes and 4 seconds (queued for 5 seconds)
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Status Job ID Name Coverage
  Container
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debian-10:amd64

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  Build
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lava-rk3288-veyron-jaq
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piglit-glslparser+quick_shader

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